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CH 16 molecular genetics questions (2) 2

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CH. 16 - MOLECULAR GENETICS QUESTIONS
1. Briefly describe Griffith's experiments with Streptococcus pneumoniae
which led to early information about the genetic material and
transformation.
2. Briefly describe how Watson and Crick came to the discovery of the
double helix structure of DNA.
3. What are Charglaff's rules? What organisms obey these rules?
4. Diagram the basic structure of a nucleotide. Identify the carbon atoms in
your diagram(use 1' to 5').
5. Diagram a purine and a pyrimidine.
6. What purines and what pyrimidines are found in DNA?
7. Diagram a small strand of DNA showing the hydrogen bonds between A-T
and C-G.
8. Draw a section of DNA showing the double helix structure.
9. What is meant when we say that the two strands of DNA are
"antiparallel"?
10. Can DNA be made without a "template" of previously existing DNA?
11. What is semiconservative replication? Describe how DNA is replicated
semiconservatively.
12. Are Okazaki fragments parts of ground up Japanese biologists? If not
what are they?
13. In which direction is DNA copied? (3' to 5' or 5' to 3')
!1
14. What is DNA "proofreading"? Does it work very well or are there alot of
misteaks that creap throug?
15. What do each of the following enzymes do?
DNA gyrase
"rep" or DNA helicase
DNA polymerases
DNA ligase
16. Complete the chart comparing DNA and RNA:
DNA
RNA
# OF STRANDS
TYPE OF SUGAR
PURINES
PYRIMIDINES
WHERE FOUND IN
CELL?
!2
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